(=unemployed)au chômage→ 186,000 steel workers are idle.→ Whole streets of men were idle.

[factory, machinery]au repos→ factories that had been idle for years→ 6 per cent of the country's factories were idle.→ factories which are temporarily idleto lie idle
[factory, machinery]rester à l'arrêt→ The processing plant lay idle for two years.to stand idle
[factory, machinery]demeurer à l'arrêt→ The machinery could not be converted, and so stood idle.